Year	Percent
1950	8.904
1955	8.7231
1960	9.70643
1965	10.95945
1970	11.76278
1975	11.82972
1980	10.39841
1985	9.95542
1990	12.04191
1995	14.09292
2000	15.60187
2005	17.2675
2010	18.77391
2015	22.19883
2020	25.19811
2025	27.88347
2030	30.39768
2035	32.58534
2040	35.02965
2045	36.74102
2050	37.49394
2055	36.99531
2060	36.03538
2065	34.9874
2070	34.74829
2075	34.88778
2080	35.03376
2085	35.11644
2090	35.15414
2095	35.2703
2100	35.59413